Birds in a Blizzard

Another crow sighting...a couple of them, poking along the beach in the driving wind and blowing snow.  Which brings up the question: how do birds stay warm?  Randy answered this question on our trip by pointing out that sometimes they don't, and they end up freezing to death.  I had supposed maybe they had some special insulation and didn't feel the cold like we do (practically hairless, we are!).  I suppose geese do have their down, but what about these crows?  I feel for them, as this is the forecast for today:

Nowcast as of 10:00 am EST on December 12, 2010

Now Blizzard Warning in effect until 7 am EST Monday... At 11 am...blowing snow. Snow. Snow may be heavy at times. Temperature around 22. North winds around 25 mph with gusts to 40 mph. At 1 PM...blowing snow. Snow. Snow may be heavy at times. Temperature around 21. North winds around 26 mph with gusts to 40 mph. At 3 PM...blowing snow. Snow. Snow may be heavy at times. Temperature around 20. North winds around 29 mph with gusts to 40 mph.

Yes, we are in a bona fide blizzard.